Lubricating system



2 Sheets-Sheet 2 June 21 1927.

. D. H. SWEET LUBRICATING SYSTEM Filed Janzge. 1926 high suction eerieeTATES A5331) IEWEET, 0F EVANSTON, ELLENOIS.

iisenicmme sys'mu.

ufii siilication filed January 29, 1926. Serialilo. $4,726.

cal i011 of the miscellaneous chassis hearings c motor vehicle sncl forsimilar uses.

"he sort commonly re heretofore 1 less eici. hearing econli s31};iiessiire the system more less constencly Uni mg use of the vehicle andshe sn aenietic 3c tionrnenic or" the lilhricantto the differentcearings occurs pri: marily on the basis of the resistance or differentparts of ihe system to the flow of lubricant.

The presence of may Ell ineterial amount of air in a system of the 4stifpe renders it; in many instances substantial y inoperative, andsystems or the second type are also seriously interfered with when airgets into there. Air may enter such e system in ihe form of smellbubbles in the lubricant itself, which collect sin the high points ofthe system, or may be sucked in when the syslein is inecr' either by thelubricant flow ing out und r the action o1? grzivit or log! the muchthat may oleveloo in case the is throughout zinc; occurs. llms cooling sillmosl; complete ien-i at times, miess re which, uncle? such certain.clo. eclvenlegee oi l e ennrnerel:

action niey vacuum ins leaks imon 1 in erelicn closing;

Further olciects i vention will become apparentas the descriptionproceeds,

Zn f'che accompanying drawings: '55

Figure 1 is s diagram or n lubricating sys iem according to'izheinveni-ion,

igure 2 is s slbructnrsl section or the senerc tion enolrelief onlectecl .lQl lubricant iliron separation and ii i v see.- which the mainheader ill rious branches each "Elli ll?" n e 'iifilllll nel 20associated with one ciz' she bearings 22 to he lubricated, v

The chamber 14; has an axial outlei, 24 at its top, within. which l.mount e tube 26 constricted et 28 and provided with s seat 30 forsbutmens with the upper end. of. the valve member 3%, whereby e, iigstseal may be formed to withsrencl relatively high pressures. Above theconstriction 28 the tube carries an outwardly opening check valve 3econstructed to open e precleien mined pressure of, seyfiliree poundgringo. A similar CllBCli; valve 3&- .is nositionecl in n lcoss M) atrile top of container, being set open inwerrlly and}. cl iistcrl toadmin nir "co the clisilnoer i l nnc ssui-e rlii of, my, will inchcoi'respon nonnels with As each o a return A may ci tiel relieve om h -until the valve 62 closes.

of the pump and other parts of the able or preierredtype.

chamber 1d should be sufficient toabsorb the bod maximum thermal willbe'subjected. v I

henever material has been withdrawn from chamber 14 by thermalcontraction, as when the car has been parked in a cold and the vehicleis again put into use and lubricant is delivered under pressure throughthe connection at 12 it will be obvious that as soon as the pump hasdeveloped enough efiect to which the system pressureto open the checkvalve 36 the air.

admitted through expelled through the level ofthe the check valve 38Will be the check valve 86, raising liquid in the chamber 14 After this,the pressure may continue torise to a point lim- -ited only by thepressure producing capacity system. The pump by intermittentpressure-impulses, it will be 0 vious that part or substantially all ofthe annular airspace upper portion of the chamber to the'sha e of thefloat and the valve 34-. Where the pump, when not in use,

' preventing flow of lubricant into the connec- 1 Well as before it thepolling any airsucked into it when it is- "illustrated a valveconstruction of particuof: the system and the resultant lowering atimmaterially again started. Any air entering throu h the. connection at12 will rise in the chain or 14 of the float 42 Will open the valve 32and permit ejection of an'equal amount of air to restore a properoperating condition. The same svill occur with any bubbles that may beforced in through the connection 12 by a defectwepum I" aveillustrated adust cap 48 clamped in place by resilient tongues 50' andapertured bybreather holes at 52.

Referring new to Figures 3 and d, I have lar advantage in connectionwith asystem embodying such a separation and relief chamber as abovedescribed. The branch tube 18 is clamped in a body 54 by suitablechamber Within place,-

indicated may be of any suit I Where it. operates l at 44 in Figure 2can be eliminated by conforming the shape of the does not form a seal h46 shouldpreferably required to openpressure to limit the pressure ymeans such as the clamping ring 56 and the in turn connected in nut 58.The body 54 is tothe end piece 60 threaded at 62 for screwmgthe sameinto the bearing 22. The sys tem illustrated apportions the lubricant ona basis of resistance, .I have shovvn a tapered resistance plug 64having a spiral groove 66 in its outer surface and jammed tightly intothe tapered bore 68 in the end piece 60. The y 54, end-piece60 and plug64 define a which the valve is housed. The valve shown comprises anouter cup 72 and an inner cup 74 telescoped therein to form ahermetically sealed capsule of sub stantially the same specific gravityor density as the lubricant to be handled by the system. The valve maybe held against movement in the direction of. discharge by abutment witha shoulder '7 6 in the and piece 60 slots 78 being providedto maintaincommunication between the chamber and the passe 66 at all times. On theshoulder 80 at the other end of the chamber I provide a flexiblepackingor seat 82 to engage the edge of the valve andifonn a'tight seal.The

clearance at 84 is preferably of the order of;

magnitude of'a few thousandths of an inch.

ar passage may be comparable with that of the passage 66 and will.assist materially in increasing. the range of resistances applied to thedifferent bearings. tendency to-produce a return flow past thisresistones will immediately move the'valve back against its seat beforeany appreclable flow as occurred.

a convenience in standardizing the valves, -I prefer to design the innercup with 11 some systems the resistance of this annuill) lid

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a dome at 86. The valves can then be assembled within the limits ofaccuracy possible in quantity production and floated through a bathhaving a specific gravit representing the li hter limit of the to eranceper- Qmtted in the finished valve. Any valve that its too light maythenbe dented in as at 88 to decreaseits volume without changing its Wei htand bring it Within the tolerance.

l ithout further-elaboration the foregoing will so fully-explain thegistof my invention, that'others may, by applying current knowledge,readily adapt the same for use under various conditions of service,Without eliminating certain features which may properly be said toconstitute the essential items of novel' involved, "which items areintended to be efined and secured tome by the following claims.

I claim:

1. The combination vvith'a pressure lubrieating stem of a chambercommunicating therewit means for admitting air into said chamber at apredetermined vacuum to limit the suction in the system, means forlettin air out of the system at a predetermined 1n the system,

limiting means inoperative when said chamher is full.

2. The combination with a pressure lubricating system, of a chambercommunicating therewith, means for admitting. air into said chamber at apredetermined vacuum to limit the suction in the system, means forletting air out of the system at a predetermined pressure to limit thepressure-in the system, and automatic means actuated in accordance withthe amount of lubricant in said chamber, for rendering said pressurelimiting means inoperative when said chamber is full.

3. The combination with a pressure lubricating system, of a chambercommunicating therewith, means for letting air out of the system at apredetermined pressure to limit the pressure in the system, andautomatic float means actuated in accordance with the amount oflubricant in said chamber, for rendering said pressure limiting meansinoperative when said chamber is full.

4. A lubricating system comprising the combination with a plurality ofbearings, of a pump, a branch system of pipes leading from said pump tosaid bearings, a check valve at each bearing opened by pressure in thepipes and closed by a suction in the pipes only, and. means for limitingthe suction in the system to a predetermined value.

In witness whereof, I hereunto subscribe my name this 26 day of January,1926.

DONALD H. SlVEET.

